Home Assistant Blueprint: Link Multiple Switches v1.0.1

link_multiple_switches.yaml

blueprint:
  name: Link Multiple Switches
  description: |
    ## Link multiple switches together v1.0.1

    Select multiple switch entities to link their on/off state.  If any selected switch entity is turned on or off, the other selected entities will be sent a matching on or off command.

    Requires Home Assistant 2022.5.0 or newer.
    Credit to @adchevrier for the initial blueprint: https://community.home-assistant.io/t/synchronize-the-on-off-state-of-2-entities/259010
    Credit to @Hebus for this fantastic template: https://community.home-assistant.io/t/synchronize-the-on-off-state-of-2-entities/259010/38
  domain: automation
  homeassistant:
    min_version: 2022.5.0
  input:
    switches:
      name: Switch Entites
      selector:
        entity:
          domain: switch
          multiple: true
  source_url: https://gist.github.com/aderusha/4f25658dbb855675b5b5ccf296fd801b

mode: queued
max_exceeded: silent

variables:
  switches: !input 'switches'

trigger:
- platform: state
  entity_id: !input 'switches'

condition:
- condition: template
  value_template: '{{ trigger.to_state.state != trigger.from_state.state }}'
- condition: template
  value_template: '{{ trigger.to_state.state != "unknown" }}'
- condition: template
  value_template: '{{trigger.to_state.context.parent_id is none or (trigger.to_state.context.id != this.context.id and trigger.to_state.context.parent_id != this.context.id) }}'

action:
- service: homeassistant.turn_{{ trigger.to_state.state }}
  target:
    entity_id: '{{ expand(switches) | selectattr("entity_id", "!=", trigger.entity_id) | map(attribute="entity_id") | list }}'

This one too to prevent unavailable states

trigger:
- platform: state
  entity_id: !input switches
  to:
    - 'off'
    - 'on'